package com.sfac.springboot.springboot.listenet;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import java.io.File;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

@WebListener
public class Loglistener implements ServletContextListener {

    private final static Logger LOGGER =  LoggerFactory.getLogger(Loglistener.class);

    @Override
    public void contextInitialized(ServletContextEvent sce) {
        LOGGER.debug("------- init log  listener--------");

        //获取/var/log 日志文件，判断是否存在，如果不存在直接返回，不包含删除
        File file = new File("/var/log");
        if (file == null){
            return;
        }

        //获取当前日期字符串
        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-mm-dd");
        String currentDateString = dtf.format(LocalDateTime.now());
        
        //获取/var/log 下日志文件列表，循环判断文件名称是否包含日期字符串
        File[] files = file.listFiles();
        for (File temp :files){
            String name = temp.getName();
            if (!name.contains(currentDateString)){
                temp.delete();
            }
        }

    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        LOGGER.debug("------- init log  listener--------");

    }
}

